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4d-40=d+5
We move all terms to the left:
4d-40-(d+5)=0
We get rid of parentheses
4d-d-5-40=0
We add all the numbers together, and all the variables
3d-45=0
We move all terms containing d to the left, all other terms to the right
3d=45
d=45/3
d=15
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